Evolution of phenotypic disparity in the plant kingdom
James Clark, Alexander J. Hetherington, Jennifer L. Morris, Silvia Pressel, Jeffrey G. Duckett, Mark N. Puttick, Harald Schneider, Paul Kenrick, Charles H. Wellman, Philip C. J. Donoghue
Abstract
The plant kingdom exhibits diverse bodyplans, from single-celled algae to complex multicellular land plants, but it is unclear how this phenotypic disparity was achieved. Here we show that the living divisions comprise discrete clusters within morphospace, separated largely by reproductive innovations, the extinction of evolutionary intermediates and lineage-specific evolution. Phenotypic complexity correlates not with disparity but with ploidy history, reflecting the role of genome duplication in plant macroevolution. Overall, the plant kingdom exhibits a pattern of episodically increasing disparity throughout its evolutionary history that mirrors the evolutionary floras and reflects ecological expansion facilitated by reproductive innovations. This pattern also parallels that seen in the animal and fungal kingdoms, suggesting a general pattern for the evolution of multicellular bodyplans.